Avoiding fluoride reduces exposure to a non-essential mineral linked to enamel spotting and, at higher exposures, lower childhood intelligence scores and thyroid changes. Trade-off is higher cavity risk unless hygiene, lower sugar, and fluoride-free enamel-protecting toothpaste keep teeth protected. Case is strongest with high water fluoride and early brain development; keep load modest in low iodine and reduced kidney function. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Water fluoride (mg/L) | As low as practical for avoidance goals | Confirms exposure from primary source |
| Urinary fluoride (mg/L) | Lower reflects lower recent exposure; no universal clinical optimal | Proxy for total recent intake |
| TSH (mIU/L) | Often ~0.5–2.5 in functional practice | Screens thyroid axis |
| Free T4 | Within lab reference; mid-range often preferred | Thyroid hormone availability |
| eGFR / creatinine | eGFR ≥90 mL/min/1.73 m² ideal | Fluoride clearance depends on kidneys |
| Dental caries index / new lesions | No new cavities; stable or improving risk score | Primary clinical harm when avoiding fluoride |
| Dental fluorosis score (children) | None to questionable only | Documents prior excess during tooth formation |
Cadence: Baseline water fluoride, products, TSH/free T4 if thyroid risk factors, eGFR, and dental exam. Ongoing: thyroid if symptoms or pregnancy; dental every 3–6 months if moderate–high caries risk; filter maintenance every 6–12 months.